Outlaw said the smoke rose from a small fire in the engine compartment, which was extinguished quickly. The students who were on board safely disembarked the bus. Outlaw said no injuries were reported, but some of the students were later taken to Northeast Memorial Hermann hospital as a precaution.

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The school's chief academic officer, Paul Hardin, said the bus driver on the school's Purple Route noticed smoke in the passenger compartment of the bus as she was driving. She told students to open the windows for ventilation and then to stay low near the floor because the smoke rose toward the ceiling. She pulled safely to the side of the road and alerted authorities.

Hardin said school officials sent another bus to pick up the some 40 student who had been on the disabled bus. They were taken to campus. The school, Hardin said, is for Pre-K to 8th grade students. He said the students would have been in that age group.

Hardin said school officials called paramedics to the campus to examine the students who had been on board the smoky bus. Paramedics, Hardin added, said 18 of the students had slightly elevated yet safe levels of carbon monoxide in their systems and were taken to the hospital as a precaution.